20
17 15 19 12 16 14 13 20 11 18 
17 11 14 12 16 15 18 13 19 20 
17 14 11 19 15 13 16 18 20 12 
13 18 20 14 17 15 19 11 16 12 
11 19 14 13 16 17 15 18 12 20 
17 12 15 13 14 16 11 18 19 20 
13 20 16 18 15 19 11 14 12 17 
20 16 12 18 19 17 11 15 14 13 
12 11 13 15 20 18 19 14 17 16 
11 17 14 12 16 19 15 20 18 13 
3 4 10 6 5 8 7 1 9 2 
4 9 5 8 1 6 10 2 3 7 
2 9 1 5 6 4 3 8 7 10 
2 9 1 8 5 3 6 4 10 7 
9 3 5 6 7 4 8 10 2 1 
6 9 4 10 1 7 5 3 8 2 
10 6 2 7 1 5 9 4 3 8 
6 1 3 10 8 4 9 2 7 5 
6 9 8 2 7 1 4 10 5 3 
6 7 3 9 2 1 8 5 10 4 
forbidden 1 11
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forbidden 1 15
forbidden 1 20
forbidden 2 11
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forbidden 2 17
forbidden 2 19
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forbidden 3 11
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forbidden 3 15
forbidden 3 18
forbidden 4 14
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forbidden 4 19
forbidden 5 15
forbidden 5 17
forbidden 5 20
forbidden 6 12
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forbidden 7 11
forbidden 7 15
forbidden 7 18
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forbidden 8 11
forbidden 8 13
forbidden 8 16
forbidden 8 19
forbidden 9 11
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forbidden 9 17
forbidden 9 20
forbidden 10 11
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forbidden 10 14
forbidden 10 17
forbidden 10 18
forbidden 10 19